Spiess Tuning is the common identity of Siegfried Spiess Motorenbau GmbH, a motor vehicle engine company based in Ditzingen, Baden-Württemberg, Germany. Siegfried Spiess Motorenbau GmbH is a family-run company that develops, manufactures and services its own high-performance engines in second generation. Currently, three pillars form the Siegfried Spiess Motorenbau GmbH: Spiess RACing, Spiess Classic and Spiess CNC. Spiess RACing is responsible for the development, production and assembly of racing engines. This also includes the on-site support of the teams and drivers. Spiess Classic is mainly concerned with the design and restoration of young and classic car engines. Spiess CNC manufactures complex one-offs and also offers contract manufacturing, both for private individuals and for companies. The company´s founder Siegfried Spiess Siegfried Spiess had direct contact with engines and vehicles since his childhood, as his parents ran an NSU and Mercedes workshop in Stuttgart Weilimdorf. Eventually, he learned and worked as a car mechanic. Later, Siegfried Spiess passed his master craftsman's examination in the motor vehicle craft. His wife Brigitte gave him two sons, Holger and Jürgen. Holger Spiess is currently one of the managing directors of Siegfried Spiess Motorenbau GmbH, together with Samuel Schleier. Between 1963 and 1968, Siegfried Spiess won several championship titles on NSU vehicles. In 1963, he became German hillclimb champion on a NSU Prinz, in 1965 on an NSU 1000 TT. After the runner-up title in 1966, he won the Bergmeister title two years in a row in 1967 and 1968 on an NSU Wankelspider. This was followed by the runner-up title again in 1969. At the end of 1969, 'Siggi' Spiess said goodbye to active racing, but still occasionally took part in races until 1975. Siegfried Spiess tuned NSU engines into excellent power units that were used worldwide with great success. On March 22, 1972, he left his parents' business and founded his trademark: Spiess Tuning. His workshop in Weilimdorf, which, however, quickly became too small, was followed by several locations to meet the increasing demand. Company history On behalf of NSU, Siegfried Spiess not only tuned the engines but also built the entire vehicles. After the last NSU rolled off the production line in 1972 and Willi Bergmeister had won the last of the numerous championship titles with a Spiess-NSU engine in 1974, Siegfried Spiess reoriented himself and focused on the 1.6 litre GTI engine from the Golf/Scirocco series for the first time. The 1.6-litre